E1 Pinout » History » Version 3
laforge, 11/02/2019 07:33 PM
| 1 | 1 | laforge | h1. E1 Pinout |
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| 3 | This page tries to summarize various E1 line pin-outs. |
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| 5 | 2 | laforge | |_.Name|_.RJ45 Digium|_.RJ45 Auerswald|_.Livingston PM3| |
| 6 | |RxN (ring)|1|1|1| |
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| 7 | |RxP (tip)|2|2|2| |
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| 8 | |TxN (ring)|4|4|4| |
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| 9 | |TxP (tip)|5|5|5| |
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| 10 | |UB-|-|7|-| |
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| 11 | |UB+|-|8|-| |
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| 12 | 1 | laforge | |
| 13 | 3 | laforge | *When connecting two E1 ports with another, the Rx pair always needs to be crossed over to the Tx pair of the other side. There is no feature like Auto-MDI-X in Ethernet!* |
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| 15 | h2. E1 cross-over |
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| 16 | 1 | laforge | |
| 17 | See https://support.digium.com/community/s/article/How-do-I-make-a-T1-E1-Crossover-cable |
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| 18 | |||
| 19 | A T1/E1 crossover cable has pin 1 routed to pin 4 and pin 2 routed to pin 5. |
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| 22 | Pin 1 will be the far left pin when holding the plug with the lock-tab facing away from you. Pin 8 will then be the far right pin. |
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| 25 | 1 <-> 4 |
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| 26 | 2 <-> 5 |
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| 28 | The other pairs of the cable should all be routed straight through (the T568A standard may be used as an example for this). |
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| 31 | This is not compatible with an Ethernet cross-over cable which swaps 1<->3 and 2<-> 6 (and optionally 4 <->7 and 5 <-> 8). |
